Observations of gamma-ray spectra and X-ray images of solar flares

Details Observations of gamma-ray spectra and X-ray images of solar flares Observations of gamma-ray spectra and X-ray images of solar flares

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aipc..374..210y&link_type=abstract

High energy solar physics. AIP Conference Proceedings, Volume 374, pp. 210-218 (1996).

Physics

Solar Electromagnetic Emission

Scientific paper

Two gamma-ray flares were observed with a gamma-ray spectrometer and two X-ray imagers aboard YOHKOH. The gamma-ray flare on 27 October 1991 showed strong narrow deexcitation lines and two bright hard X-ray sources. We discuss a gamma-ray production site from comparison the gamma-ray (4.5-6.8 MeV) time profile with the hard X-ray (53-93 keV) time profile of each hard X-ray bright source. The gamma-ray lines are thought to be produced at one of the two hard X-ray sources. The gamma-ray flare on 3 December 1991 showed strong continuum extending about 8 MeV without detectable gamma-ray line. It implies that electrons were preferentially accelerated to relativistic energies. The rapid enhancement in hard X-ray (53-93 keV) emission was observed nearly simultaneously with the large change in flaring loop structures. It suggests that the electrons were efficiently accelerated by strong electric field induced by the rapid variation in the magnetic field.

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